Pep8 compliant

theano/tensor/opt.py

@@ -2234,27 +2234,39 @@ def local_cast_cast(node):
             v = node.op(base)
             return [v]
 
+
 def upcast(type1, type2):
-    '''
-    Given two data types (as strings), check if converting to 
+    """Given two data types (as strings), check if converting to
     type2 from type1 constitutes an upcast.
-    '''
+
+    """
     upcast_pairs = (
-        ('int8','int16'),('int8','int32'),('int8','int64'),('int16','int32'),('int16','int64'),('int32','int64'),
-        ('uint8','uint16'),('uint8','uint32'),('uint8','uint64'),('uint16','uint32'),('uint16','uint64'),('uint32','uint64'),
-        ('float16','float32'),('float16','float32'),('float16','float64'),('float32','float64'),
-        ('complex64','complex128'),
-
-        ('uint8','int16'),('uint8','int32'),('uint8','int64'),('uint16','int32'),('uint16','int64'),('uint32','int64'),
-        ('int8','float16'),('int8','float32'),('int8','float64'),('int16','float32'),('int16','float64'),('int32','float64'),
-        ('uint8','float16'),('uint8','float32'),('uint8','float64'),('uint16','float32'),('uint16','float64'),('uint32','float64'),
-
-        ('int8','complex64'),('int16','complex64'),
-        ('uint8','complex64'),('uint16','complex64'),
-        ('float32','complex64'),
-        ('int8','complex128'),('int16','complex128'),('int32','complex128'),
-        ('uint8','complex128'),('uint16','complex128'),('uint32','complex128'),
-        ('float32','complex128'),('float64','complex128')
+        ('int8', 'int16'), ('int8', 'int32'), ('int8', 'int64'),
+        ('int16', 'int32'), ('int16', 'int64'),
+        ('int32', 'int64'),
+        ('uint8', 'uint16'), ('uint8', 'uint32'), ('uint8', 'uint64'),
+        ('uint16', 'uint32'), ('uint16', 'uint64'),
+        ('uint32', 'uint64'),
+        ('float16', 'float32'), ('float16', 'float32'), ('float16', 'float64'),
+        ('float32', 'float64'),
+        ('complex64', 'complex128'),
+
+        ('uint8', 'int16'), ('uint8', 'int32'), ('uint8', 'int64'),
+        ('uint16', 'int32'), ('uint16', 'int64'),
+        ('uint32', 'int64'),
+        ('int8', 'float16'), ('int8', 'float32'), ('int8', 'float64'),
+        ('int16', 'float32'), ('int16', 'float64'),
+        ('int32', 'float64'),
+        ('uint8', 'float16'), ('uint8', 'float32'), ('uint8', 'float64'),
+        ('uint16', 'float32'), ('uint16', 'float64'),
+        ('uint32', 'float64'),
+
+        ('int8', 'complex64'), ('int16', 'complex64'),
+        ('uint8', 'complex64'), ('uint16', 'complex64'),
+        ('float32', 'complex64'),
+        ('int8', 'complex128'), ('int16', 'complex128'), ('int32', 'complex128'),
+        ('uint8', 'complex128'), ('uint16', 'complex128'), ('uint32', 'complex128'),
+        ('float32', 'complex128'), ('float64', 'complex128')
     )
 
     for pair in upcast_pairs:
@@ -2262,6 +2274,7 @@ def upcast(type1, type2):
             return True
     return False
 
+
 @register_canonicalize
 @register_specialize
 @gof.local_optimizer([T.Elemwise])